Answer:
36
Step-by-step explanation:
72+3x=180(being sum of straight angle)
3x=180_72
3x=108
x=108÷3
x=36
remember that if and . This means that always is a positive number.
Then, there are no numbers such that because -3 is a negative number.
i think a
hope you get idea of graphing the four lines
Those are functions on a calculator. Mostly used for Trigonometry.